import { ConvertConfig, BooleanFields, ObjectFields, ArrayFields } from './types';

function convertBoolean(fields: BooleanFields, value: any, reverse: boolean) {
    let result: any = undefined;
    if (reverse) {
        fields.true !== undefined && value && (result = fields.true);
        fields.false !== undefined && !value && (result = fields.false);
    } else {
        fields.true !== undefined && fields.true === value && (result = true);
        fields.false !== undefined && fields.false === value && (result = false);
    }
    return result;
}

function convertObject(fields: ObjectFields, value: any, reverse: boolean) {
    let result: any = {};
    reverse
        ? result = value
        : fields.keys && fields.keys.forEach(key => (result[key] = value[key]));
    return result;
}

function convertArray(fields: ArrayFields, value: any[], reverse: boolean) {
    let result: any[] = [];
    reverse
        ? result = value
        : fields.key && (result = value.map(v => v[fields.key]));
    return result;
}

/** 转换 值 为指定配置的值
 * @reserve 设置为 true 则 将转换后的值 转为 原本的值 */
export function convert(config: ConvertConfig, value: any, reserve: boolean = false) {
    let result: any = undefined;
    if (config.convertFields.getConvert) {
        result = config.convertFields.getConvert(value, config.convertFields, reserve);
    } else {
        const convertFns = ({
            object: convertObject,
            boolean: convertBoolean,
            array: convertArray
        } as any)[config.convertType];
        convertFns && (result = convertFns(config.convertFields, value, reserve));
    }
    return result;
}